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Structures, Organization, and Function of Reflectin Proteins in Dynamically Tunable Reflective Cells.

Daniel G DeMartini1, Michi Izumi2, Aaron T Weaver3

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Cephalopod iridescence, driven by reflectin proteins in skin cells, is dynamically tuned by specific reflectin sequences and their phosphorylation. This allows for adaptable color and intensity control in cephalopod camouflage and communication.

Keywords:
biomaterialsbiophotonicscell signalingdynamic coloriridescenceiridocyteiridophoremass spectrometry (MS)phosphorylationprotein assemblyprotein self-assemblyreflectin

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Area of Science:

  • Marine Biology
  • Biophysics
  • Biochemistry

Background:

  • Cephalopods exhibit dynamic iridescence, a visual adaptation crucial for camouflage and communication.
  • This iridescence is generated by intracellular Bragg reflectors within specialized skin cells known as iridocytes.
  • Reflectin proteins are the key components responsible for the tunable optical properties of these reflectors.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the dynamic iridescence in cephalopods.
  • To identify specific reflectin sequences and their roles in controlling iridescence tunability.
  • To explore the post-translational modifications and localization of reflectins in relation to their function.

Main Methods:

  • Analysis of tissue specificity of different reflectin subtypes.
  • Investigating the correlation between specific reflectin sequences and iridescence tunability.
  • Examining differential phosphorylation and dephosphorylation of reflectins.
  • Assessing tissue-specific and subcellular spatial distributions of reflectins.

Main Results:

  • A specific reflectin sequence was found to be correlated with the tunability of iridescence.
  • Differential phosphorylation and dephosphorylation of reflectins were observed upon acetylcholine activation.
  • Distinct tissue-specific and subcellular distributions were identified for different reflectin subtypes.

Conclusions:

  • The reversible assembly of reflectin proteins is central to dynamic iridescence in cephalopods.
  • Specific reflectin sequences and their post-translational modifications (phosphorylation) dictate the tunable optical properties.
  • Variations in reflectin subtypes contribute to specialized roles in iridocytes, enabling sophisticated visual signaling.